Fixed typo on delivery & failure page
Fixed typo on delivery & failure page

Under 'Phone number or email address does not exist' section - there was a typo, ammended to say 'existent' rather than 'existant'

alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin,gov-cjwaszczuk/notifications-admin,gov-cjwaszczuk/notifications-admin,gov-cjwaszczuk/notifications-admin,gov-cjwaszczuk/notifications-admin,alphagov/notifications-admin